- Journal Article
Rights / licenseIn Copyright - Non-Commercial Use Permitted
The microquasar V404 Cygni underwent a series of outbursts in 2015, June 15–31, during which its flux in hard X-rays (20–40 keV) reached about 40 times the Crab nebula flux. Because of the exceptional interest of the flaring activity from this source, observations at several wavelengths were conducted. The MAGIC telescopes, triggered by the INTEGRAL alerts, followed-up the flaring source for several nights during the period June 18–27, for more than 10 h. One hour of observation was simultaneously conducted on a giant 22 GHz radio flare and a hint of signal at GeV energies seen by Fermi-LAT. The MAGIC observations did not show significant emission in any of the analysed time intervals. The derived flux upper limit, in the energy range 200–1250 GeV, is 4.8 × 10−12 photons cm−2 s−1. We estimate the gamma-ray opacity during the flaring period, which along with our non-detection points to an inefficient acceleration in the V404 Cyg jets if a very high energy emitter is located further than 1 × 1010 cm from the compact object. Show more
Journal / seriesMonthly Notices of the Royal Astronomical Society
Pages / Article No.
PublisherOxford University Press
Subjectstars: individual: V404 Cygni (V404 Cyg); gamma-rays: general; X-rays: binaries
Organisational unit08823 - Biland, Adrian (Tit.-Prof.)
NotesIt was possible to publish this article open access thanks to a Swiss National Licence with the publisher.
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